
Geophysik III / Geophysics III
Karl Rawer(Editor)
Springer (Publisher)
Published on 23. August 2014
Book
Paperback/Softback
XXXV, 2464 pages
978-3-642-46279-5 (ISBN)
Description
Sect. 14. 297 for such slow variations the effect described under 2. above will be by far the most predominant. In fact, the equipment provides a record of the time derivative of the element in question. 6) Records of the time derivatives of magnetic elements can, however, be obtained in a more direct way by recording directly the electromotive force (e. m. f. ) induced in suitably disposed coils by the variations of the geomagnetic field 10, 11. When a coil with the total winding area F is placed with its axis in the direction of a geomagnetic force component the variation of magnetic induction B with time will produce an electromotive force 1 dB 1 dH e=- coveu, uuFdT=- 'oV, uQf1oFdT (i). )) . !. . =_to-13 d(B/y) (1). )a) v em! d(tjs) in the coil. The e. mJ. may be amplified and recorded by means of an oscillograph or on a tape recorder. but more often the coil is used in connection with an ordinary galvanometer and the scale value of, for instance the dl1/dt record, will then - in the same way as the scale value of the magnet variometer treated in Subsect. IX - be dependent on the damping factor IX and on TO/T, where To and T are the oscillation periods for the undamped galvanometer and for the magnetic pulsation respectively. The amplitude recorded will be proportional to the amplification factor I, obtained from Eq. (1).
More details
Series
Edition
Softcover reprint of the original 1st ed. 1984
Language
English
Place of publication
Berlin
Germany
Publishing group
Springer Berlin
Target group
Professional and scholarly
Research
Illustrations
XXXV, 2464 p. In 5 volumes, not available separately.
Dimensions
Height: 244 mm
Width: 170 mm
Thickness: 136 mm
Weight
4297 gr
ISBN-13
978-3-642-46279-5 (9783642462795)
DOI
10.1007/978-3-642-46277-1
Schweitzer Classification
Other editions
Additional editions
Karl Rawer
Geophysik III / Geophysics III
Book
12/1972
Springer
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€85.59
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